Lifting jack



1,624,106 Apnl 12 1927 A. s. LARsoN LFTING JACK Filed Jan. 24I 1925 A TTORNE Y.

Patented 'Api'. l2, 1927. p p y UNITED STATES' PATENT OFFCE.

wisconsin.

nous s. :.Ai'isoii,l or NORTH Laxe,

' marine .'racx.

Application led yJanuary 24, 1925. Serial lo. 4,499.

The invention relates' to lifting jacks. The object ofthe invention is to provide a lifting jack having a relatively low height so that it may be used in places where the distance between the member to be lifted and the jacks support is relatively low, and to this en d the jack has a collapsible standard composed of a plurality of articulated members that are so arranged as to be moved from a position in one plane to a position in the lifting plane.

A further object of the invention is to provide a jack in which the collapsible lifting standard is composed of a plurality of members, some of which may be removably connected so that' the effective height of the lifting standard may be varied.

The invention further consists in the sev eral features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Fig. 1 is a side ele'vation view of a lifting jackembodying the invention; p

' Fig. 2 is xa vertical sectional view through the device taken on the line 2-f-2 o f Fig. 3;

Fig. 3 is a plan view of the device.

In the drawings the numeral 4 designates the frame of the device, having a base portion 5 and side portions 6 forming a longitudi'nally extending guide channel 7.

The collapsible lifting standard is formed by a plurality of articulated members 8. With the exception of the topmembers, each of these members is in the form of a' link'- a block portion 9, a pintle portion 10,

having portion 11 and a sprocket recess 12.

a hoo A part of each block adjacent'its pintle' is recessed, as at 13, so that the hook portion 11 may be slipped past this recess and over the pintle to assemble the links, though some of the linksmay not have this detachable connection.. The detachable connection, however, enables as many links to be assembled as desired,l and this, it will be s'een, permits of glie' use of lifting/standards of varying heights to suitv operating conditions. The members 8 are assembled to form what may be termed two sections which are hingedly connected at one of their ends, through the top members', which are adapted to abut against each other to form the lifting standard.

To move the parts of Dthe articulated standard -to an oplerating position. and main,- tain` .them in suc p into a lifting position,

.that it may vbe used in by a hinge 14, and

position, each articulated mounted on a shaft '18 journalled in the sides of the frame and carrying a worm wheel 19. Each worm wheel 19 meshes with a Worm 20 formed integral 'with or secured v to a shaft 21 which may be turned in an suitable manner, as by a handcran'k 22 connected to said shaft 21.

With this construction, when the parts are shown in their lowered' position, asin 2, the turning of the shaft 21 in the proper direction will, through the gears 20 and 19,

l rotatethe shafts 18 and their sprockets 15 which, meshing with the chain-typesections, moves the parts of the standard upwardly as shown in Fig. 1, and the turning of said shaft in the opposite direction will'serve to return the parts of the collapsible standard to the position vshown in Fig. 2.

Inasmuch as the parts of the standard move from a horizontal to a iverticalposition, it will be appreciated that the-overall height of the jack is relatively small so places'where the ordinary jac cannot be used.

The tops of the top members 8` of the standard may be inclined slightly, as shownl at 23, and a Ycap member 24 may`v be'itted over them and detachably secured in position by a removable pin 25.

' Because of the when the shaft 21 is not being rotated, the sprockets 15 will be prevented from rotat ing and the standard will thus be held in of the links of each .section face outwardly and that the sides of adjacentlinks of one section abut against eachother, and that the links of adjacent sections abut against, each other lwhen in form the lifting standard.

I desire it to be understood that this invention is not to be limited to any particu; lar form or`arrangement of parts except in.

so far as such limitations are included in the l0 claims.

What I claim as my invention is:

gearing connections used a5 operative positio'n to 105 l5 'articulated lifting sections operative y con' 1. In a lifting jack, the combination with a framekof a pair of articulated chain type sections 4operatively connetted together and movable toward and away from each other to form a collapsible lifting standard, guide means for turning thev sections from horizontal to vertical, s rockets engageable with the links of each o said sections at the turn to operate the standard, the uide means extending upwardly to substantially the center line between the axes of said sprockets, and means for actnatin said sprockets'.

2. In a lifting jack, t e combination with a frame havin open troughs, of a air of nected together and movable toward and away from each ether in said troughs to form a collapsible lifting said sections comprising. a series ofarticulated blocks with a single sprocket tooth enstandard, each of' gaging recess 1n each block, guide means v for turning the sections from horizontal to* vertical, sprockets engageable with thelinks of said sections at the turn to operate the standard, and means for actuating seid sprockets.

l ln testimony whereof, l 'affix illy-signahlrec v l i ADOLPH s. Linsen. 

